Account for the following :
E° value for the Mn³⁺/Mn²⁺ couple is highly positive (+1.57 V) as compared to Cr³⁺/Cr²⁺.

Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.

33.

How is the variability in oxidation states of transition metals different from that of the p-block elements?

Out of Cu⁺ and Cu²⁺, which ion is unstable in aqueous solution and why?

The Orange colour of Cr₂O₇^2– ion changes to yellow when treated with an
alkali. Why ?

Chemistry of actinoids is complicated as compared to lanthanoids. Give two reasons.

An element has atomic mass 93 g mol^–1 and density 11.5 g cm^–3. If the edge
the length of its unit cell is 300 pm, identify the type of unit cell.

Write any two differences between amorphous solids and crystalline solids.

Calculate the number of unit cells in 8.1 g of aluminium if it crystallizes in a
f.c.c. structure. (Atomic mass of Al = 27 g mol^–1)

Give reasons :
In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel
defect.